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An oculist charges $30 for an eye examination, frames, and glass lenses, but $40 for for an eye examination, frames, and plastic lenses. If the plastic lenses cost four times as much as the glass lenses, how much do the glass lenses cost?

In each case the examination and the frames are the same; the difference in cost must be due to a difference in the costs of the lenses. Since plastic lenses cost 4 times as much as glass lenses, the difference in cost must be 3 times the cost of the glass lenses.

Difference in cost=Cost of plastic-cost of glass
=4-1
=3

The difference in cost is $42-30; or $12. Since this is 3 times the cost of the glass lenses, the glass lense must cost $12/3= $4.

In each case the examination and the frames are the same; the difference in cost must be due to a difference in the costs of the lenses. Since plastic lenses cost 4 times as much as glass lenses, the difference in cost must be 3 times the cost of the glass lenses.

Difference in cost=Cost of plastic-cost of glass =4-1 =3

The difference in cost is $42-30; or $12. Since this is 3 times the cost of the glass lenses, the glass lense must cost $12/3= $4.

An oculist charges $30 for an eye examination, frames, and glass lenses, but $42 for for an eye examination, frames, and plastic lenses. If the plastic lenses cost four times as much as the glass lenses, how much do the glass lenses cost?